Why didn't Preen Garden Weed Preventer work?

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Following are the most common reasons Preen Garden Weed Preventer may not have worked: • The growing weed is not on the list of weeds that Preen Garden Weed Preventer prevents. • The weed seed had already begun to germinate, but the weed was not visible to pull. • Preen Garden Weed Preventer was not applied at the correct rate. • Preen Garden Weed Preventer was not uniformly spread across the soil surface or the area was disturbed. • Preen Garden Weed Preventer was more than 2 inches deep in the soil. • Preen Garden Weed Preventer was not watered or lightly raked into the soil, causing the Preen Garden Weed Preventer chemical to photodegrade and lose its strength. • Preen Garden Weed Preventer was not reapplied within 8 to 12 weeks. The rate at which Preen Garden Weed Preventer biodegrades in the soil and loses its effectiveness will depend on temperature, soil type, and moisture conditions of the soil. Preen Garden Weed Preventer will need to be reapplied more often in hot, humid ...